You live in a world where saltwater surrounds the places polar bears hunt. So, can they just drink from the ocean like we might imagine? No — polar bears don’t drink seawater because the salt would harm them. They mostly get water from their food, melted snow, and freshwater pools.
Seals and body fat actually give polar bears a lot of their moisture. Melt ponds and snow help out too, when the bears can find them.
Keep reading and you’ll see how these tactics let polar bears survive for weeks on the ice. The changing Arctic makes things even trickier for their water supply.
Can Polar Bears Drink Saltwater?
Polar bears usually steer clear of drinking saltwater because it messes with their bodies. They stick to food and whatever freshwater they can find to stay hydrated while they roam the sea ice.
Why Saltwater Isn’t Safe for Polar Bears
Saltwater has way more salt than polar bears can handle. If they drink seawater, their kidneys have to work overtime to get rid of all that salt.
That process burns up energy and can actually make them more dehydrated. It’s a lose-lose situation.
You might spot a polar bear near open water, but you won’t catch it drinking from the ocean like it would from a stream. Instead, the bear eats seal blubber and muscle, which give it both calories and water.
When polar bears break down fat and protein, their bodies create metabolic water. That helps cover their hydration needs.
If a bear takes in too much saltwater, it risks throwing off its electrolyte balance. That can leave the bear weak, confused, and less able to hunt.
So, polar bears stick to safer water options whenever they can.
Polar Bears and the Sea Ice Environment
Sea ice shapes where polar bears go and how they get water. In spring and early summer, melt ponds on the ice give them fresh water to drink.
On land in summer, shallow freshwater pools pop up and become handy drinking spots.
When seals are around, a polar bear’s diet gives it most of the water it needs. Seal muscle has a lot of water, and blubber gives energy that turns into metabolic water.
This keeps bears hydrated during those long stretches on the ice when there’s barely any liquid freshwater.
Polar bears use ice and prey, not the ocean, to meet their water needs. As sea ice changes, it gets harder for them to find seals and meltwater.
That makes freshwater sources even more important for their survival.
How Polar Bears Stay Hydrated in the Arctic
Polar bears have three main ways to get water: they make it inside their bodies by digesting high-fat prey, eat snow or drink from melt ponds, and nurse cubs with milk that provides both food and fluid.
Each of these helps them avoid salty seawater.
Metabolic Water from Marine Mammal Prey
When a polar bear eats a seal, it gets most of its hydration from that meal. Seal blubber is full of oils that break down into water during metabolism.
This “metabolic water” forms inside the bear as fats turn into energy. The bear gets fluid without needing to sip fresh water.
Seal muscle also has some water, though not as much as blubber. Polar bears usually go for the fat-rich parts first.
Fat gives more metabolic water per calorie than protein. Scientists, including those at Polar Bears International, point out that this adaptation helps bears survive long periods on the sea ice.
Eating Snow and Drinking from Freshwater Ponds
Sometimes, polar bears eat snow, but they avoid it if they can because melting snow costs energy. Snow comes in handy when bears need a quick drink or want to cool down after running or fighting.
During the melt season, bears drink from freshwater ponds that form on sea ice or from streams and ponds when they come ashore.
Freshwater ponds matter most in warmer months when the sea ice gets thinner. These ponds give bears direct liquid water without the salt.
Bears use them whenever they can find them. Since drinking saltwater harms mammals, polar bears avoid seawater and stick with these safer options.
Polar Bear Cubs and Mother’s Milk
If you ever watch a polar bear family, you’ll notice the cubs rely entirely on their mother’s milk for water. That milk packs a ton of fat, giving the cubs both the calories and hydration they need to grow in those first months.
Cubs spend weeks nursing in their dens. The milk keeps them hydrated, even when there’s no water around.
Mothers don’t just provide milk—they also show their cubs how to hunt and introduce them to their first solid foods. Those first meals later become the main source of moisture and water for the cubs.
Since the cubs depend on milk, the mother has to find fat-rich prey. If she can’t, the cubs’ chances of surviving drop fast.
Researchers at Polar Bears International keep a close eye on these early-life needs. They’re trying to figure out how shrinking sea ice might impact the health of cubs.
